Pulverizing-mill.



W. G. FOX, J. P. BBM E P. M. SPONOGLE.

L J. FOX, ADMINISTRATOR 0? W. 0. FOX, DEU'D.

Patented 0ct.-14.1913.1

ATTORNEY WTNESSES WILLIAM C. FOX, 0F SAN FRANCISCO, JOSEPH P. BEM, OF BERKELEY, AND FRANCIS IlI. SPONOGLE, 0F OAKLAND, CALIFORNIA; LEWIS .T. FOX ADMINISTRATOR OF SAID WILLIAM c. Fox, DEcEAsED.

PULVERIZING-MILL.

Specification of Letters Patent.

Patented Oct. 14, 1913 Application filed October 8, 1912. Serial No. 724,572.

To' all whom t may concern Be it known that we, JOSEPH I. BEM, and FRANCIS lM. SPoNoGLE, citizens of the United States/,residing respectively, at San Francisco, in the county of San Francisco, Berkeley, in the county of Alameda, and Oakland, in the county of Alameda, State of California, have invented new and useful Improvements in Pulverizing-Mills, of which the following is a specication.

The object of our invention is to provide an improved mill for pulverizing ore or other material to a great degree of tineness and efficiently and economically.

In the accompanying drawing, Figure 1 is a side elevation of the mill, broken away in parts to show the interior; Fig. 2 is a view of its upper end Fig. 3 is a View from the interior of its lower end; Fig. 4 is a broken longitudinal section through one of the rolls.

Referring to the drawing, 1 represents an inclined drum which may be of any length desired in proportionl to its diameter, but is here shown as of a length about siX times its diameter. This drum is closed at the upper end by a head 2, to which is sev cured a f1-nt. f tube 3, which revolves in a bearing et, supported' upon an upper beam 5 connected lby longitudinal beams 6 with lower beams 7, upon which are mounted bearings 8 for pairs of rolls 9, between which travels a circumferential rib 10 around the 'drum near its lower end. The drum is closed at the lower end by a head 11, formed with a central sight-hole 12, and close to its periphery with a circular series of discharge holes 13, formed with .internal threads, so that any desired number of them, may be closed by screw plugs according as it is desired to allow the material to escape more or less freely from the drum. The material to be pulverized is fed into said drum-from a ysuitable chute 14, which discharges into the central tube 3, and, after being pulverized, is discharged from the Idrum through the discharge holes 13 into a sluice box 15 or other receptacle for further treatment. Within said drum are arranged, parallel with the axis of the drum, a number of crushing rolls, which are all of the same length, being substantially the length of the interior of the drum, but are of diderent WILLIAM C. Fox,.

diameters, there being four large rolls 21, three intermediate rolls 22, and three outer small rolls 23 and two inner small rolls 24.

Each roll is formed of a shell of suitable.

metal and a filling 20 of concrete or other inexpensive heavy material, and the ends of the rolls are closed by metallic disks 25 driven tightly thereinto. The four large rolls21, are connected, and at the same'timespaced apart from one another, Iby means of links or bars 26, which are apertured near their ends, screws 27 passing through said apertures and being screwed centrally into the disks 25 in the ends of the rolls.

The lower head 11 is formed with an inwardly thickened annular vportion 28, in contact with which move the heads of the screws 27 at the lower ends of said rolls 21. The ro-lls 21 are so spaced apart that they roll out of contact with each other and in contact with the inner surface of the drum, and the outer small rolls 23 are of such diameter, in relation to the distance between the rolls 21, that they roll in'contact with the inner surfaceof the drum and also in contact with the rolls 21. Each roll 22 rolls in contact with two rolls 21, and in like manner each roll 24 rolls in contact with two of the rolls 22, the direction of rolling of the several rolls being indicated by the arrows.

The rolling motion of the crushing rolls is caused by the rotary motion of the drum, which is produced by the following-de-` scribed mechanism: The upper head of the Adrum is formed with a bevel gear 29 which meshes with a bevel pinion 31 on a shaft 32` which rotates in suitable bearings 33 and has thereon a pulley 34, by which it may be rotated from any suitable source of power.

The mode of operation of our improved ,apparatus will be obvious from the foregoing description. The ore, or other materials to be pulverized, being fed through the.

tube 3, is drawn in between the crushing rolls and crushed thereby. The degree of fneness to which the material is pulverized will `depend upon the length of the drum and its inclination to the horizontal, which may be varied by varying the number of blocks 35 support-ing its lower end.

In all prior mills of this character, so far as we are aware, in which rollers are in contact with each other, the rollers have been in which all the rollers are so arranged thatthere is no sliding friction in opposite directions between any vadjacent rollers or between the rollers and the drum, but only rollingv friction therebetween, and in consequence there is no loss of power due to this cause. 'Consequently all the power a plied can be expended in pulverizing t e material fed to the mill. Since there is no loss of power the rollers can be made considerably heavier than would otherwise be the case, and since there is but little loss by friction, they can revolve as easily as with rollers arranged according t0 prior constructions, and of muchless weight and size. For instance,rit has been found that a drum 26 inches in diameter. and 12 feet long, and provided with rollers of the comparative sizes illustrated in the dra-wing, can be revolved by hand. 'This could not be done if there were sliding friction. in oppositedirections between the rollers.

A veryiimportant advantage is due to the fact that the surfaces of the rollers moveagainst each other in the same direction and that thereby the material to be pulverized is drawn into lthe rollers, Whereas if their surfaces in contact with each other -move in opposite directions there will be no's'uch inward tendency. Another advantage attendant upon the fact that the adjacent surfaces of rollers roll always in the same direction is that thereby all rollers help one another to roll, thus rendering the mill more efficient. A further advantage is that there is very little wear upon rollers which have their contacting surfaces rolling in the same direction andthus the life of the mill is lengthened.

We claim z- 1. In a pulverizing mill, the combination of an inclined drum, a series of rolls arranged to roll in contact with the inner surface of the drum, means connecting adjacent rolls to prevent their contact with each other, and a series of smaller rolls each arranged to roll in contact with two of the rolls of the first-named series, andl out of contact with each other.

2. In a pulverizing mill, the combination of an inclined drum, a series of rolls arranged to roll in contact with the inner surfaceof the drum, means connecting adjacent rolls to prevent their contact with each other, a series of small rolls each arranged to roll in contact with two of the rolls of the rst-named series, and of such relative size that they are out of contact with. each other, and a series of still smaller rolls each arranged to roll in contact with two of the second-named series, and of such relative size that they are out of contact with each other. f

3. In a pulverizing mill, the combination of an inclined drum, and a plurality of series of rolls arranged within said drum parallel with its axis, the rolls of the different series being of dierent diameters, links connecting and spacing apart the largest rolls,'said largest rolls rolling in contact with the inner surface of the drum, small rolls rolling in contact with said inner surface and also in .contact with the largest rolls, ,each of the series of next largest -rolls rollingin contact with two ofthev` largest.. rolls. f

In testimony whereof We have hereunto set our hands in the'presence of twosubscribing witnesses.

. WILLIAM C. FOX. f "JOSEPH P. BEM.

FRANCIS M. SPONOGLE. Witnesses: l

FRANCIS M. WRIGHT, D. B. RICHARDS.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents.

Washington, D. C. 

